Journal
SURFACE & COATINGS TECHNOLOGY
Volume 123, Issue 2-3, Pages 210-218Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0257-8972(99)00511-3
Keywords
HVOF; NiAl coatings; spray parameter; thermal spray
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A high velocity, oxy-fuel (HVOF) thermal spray process has been used to deposit two commercially available NiA1 intermetallic powders, one reaction sintered and the other inert gas atomised. It was possible to deposit high quality coatings of NiA1 intermetallic at rates comparable to those of non-metallic coatings. The coatings were characterised in terms of microstructure, oxygen content, porosity and permeability, Young's modulus and hardness. Coating characteristics and properties were found to be dependent on both the powder's particle size and the spray parameter's oxygen to fuel ratio. The preferred spray parameter was that of a high oxygen to fuel ratio equivalent to 80% stoichiometry, a spherical inert gas atomised powder with a narrow particle size range between 15-45 mu m and a small percentage of particles > 50 mu m. (C) 2000 Published by Elsevier Science S.A. All rights reserved.
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